demo:
https://blog.csdn.net/weixin_37613240/article/details/130427771
https://blog.csdn.net/qq_58744641/article/details/128837479
https://www.cnblogs.com/zhuangquan/p/12795729.html
集成串口库：https://blog.csdn.net/p1279030826/article/details/119479297
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